Income Taxes (Details 5) - USD ($) $ in Millions		May. 31, 2015	May. 31, 2014
Deferred Tax Assets Liabilities Net [Abstract]
Current deferred tax assets		$ 606	$ 522
Noncurrent deferred tax assets	[1]	150	80
Noncurrent deferred tax liabilities		(1,747)	(2,114)
Net deferred tax liabilities		$ (991)	$ (1,512)

[1] Noncurrent deferred tax assets are included in the line item Other Assets in our Consolidated Balance Sheet.